CN117043482A - Sealed rolling bearing - Google Patents
Sealed rolling bearing Download PDFInfo
- Publication number
- CN117043482A CN117043482A CN202280022492.7A CN202280022492A CN117043482A CN 117043482 A CN117043482 A CN 117043482A CN 202280022492 A CN202280022492 A CN 202280022492A CN 117043482 A CN117043482 A CN 117043482A
- Authority
- CN
- China
- Prior art keywords
- grease
- rolling bearing
- sliding contact
- seal
- base oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 67
- 239000004519 grease Substances 0.000 claims abstract description 141
- 239000002199 base oil Substances 0.000 claims abstract description 68
- 239000002562 thickening agent Substances 0.000 claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 46
- 238000002156 mixing Methods 0.000 claims abstract description 35
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 78
- 239000003112 inhibitor Substances 0.000 claims description 60
- 239000003921 oil Substances 0.000 claims description 60
- -1 urea compound Chemical class 0.000 claims description 39
- 239000003963 antioxidant agent Substances 0.000 claims description 33
- 230000003078 antioxidant effect Effects 0.000 claims description 29
- 239000004215 Carbon black (E152) Substances 0.000 claims description 24
- 229930195733 hydrocarbon Natural products 0.000 claims description 24
- 150000002430 hydrocarbons Chemical class 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 23
- 150000002148 esters Chemical class 0.000 claims description 21
- 239000010696 ester oil Substances 0.000 claims description 17
- 239000000344 soap Substances 0.000 claims description 17
- 125000001931 aliphatic group Chemical group 0.000 claims description 16
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 14
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 12
- 125000002723 alicyclic group Chemical group 0.000 claims description 12
- 229920000459 Nitrile rubber Polymers 0.000 claims description 11
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- 239000005056 polyisocyanate Substances 0.000 claims description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 10
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- 238000012360 testing method Methods 0.000 description 79
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- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- HBGGXOJOCNVPFY-UHFFFAOYSA-N diisononyl phthalate Chemical compound CC(C)CCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCC(C)C HBGGXOJOCNVPFY-UHFFFAOYSA-N 0.000 description 1
- VJHINFRRDQUWOJ-UHFFFAOYSA-N dioctyl sebacate Chemical compound CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC VJHINFRRDQUWOJ-UHFFFAOYSA-N 0.000 description 1
- 229940069096 dodecene Drugs 0.000 description 1
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 125000005608 naphthenic acid group Chemical group 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229950000688 phenothiazine Drugs 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920006389 polyphenyl polymer Polymers 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 229940035044 sorbitan monolaurate Drugs 0.000 description 1
- 239000001593 sorbitan monooleate Substances 0.000 description 1
- 235000011069 sorbitan monooleate Nutrition 0.000 description 1
- 229940035049 sorbitan monooleate Drugs 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 235000019337 sorbitan trioleate Nutrition 0.000 description 1
- 229960000391 sorbitan trioleate Drugs 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- CTJJGIVJOBVMEO-UHFFFAOYSA-N tetraoctyl benzene-1,2,4,5-tetracarboxylate Chemical compound CCCCCCCCOC(=O)C1=CC(C(=O)OCCCCCCCC)=C(C(=O)OCCCCCCCC)C=C1C(=O)OCCCCCCCC CTJJGIVJOBVMEO-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- JNXDCMUUZNIWPQ-UHFFFAOYSA-N trioctyl benzene-1,2,4-tricarboxylate Chemical compound CCCCCCCCOC(=O)C1=CC=C(C(=O)OCCCCCCCC)C(C(=O)OCCCCCCCC)=C1 JNXDCMUUZNIWPQ-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Lubricants (AREA)
- Sealing Of Bearings (AREA)
- Rolling Contact Bearings (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Devices (AREA)
Abstract
The invention provides a sealed rolling bearing which has low torque and high sealing performance. The hub bearing 1 includes a seal member 13 for sealing and fixing the bearing space 9 to the fixed side member 12 and for sliding contact with the rotating side member 15, the seal member 13 having a seal lip for sliding contact with the rotating side member 15, and a surface of at least one of a sliding contact surface of the seal lip and a sliding contact surface of the rotating side member 15 in sliding contact with the seal lipCoated with a grease comprising a kinematic viscosity of 6mm at 40 DEG C 2 /s～45mm 2 The blending consistency of the base oil and the thickener according to JIS K2220 is 220-320.
Description
Technical Field
The present invention relates to a seal type rolling bearing including a seal member, and more particularly to a seal type rolling bearing such as a hub bearing for supporting an axle.
Background
In general, a grease composition for lubrication is enclosed in a rolling bearing. Bearings in which the grease composition is sealed have a long life, do not require an external lubrication unit or the like, and are inexpensive, and therefore are often used in general-purpose applications such as automobiles and industrial equipment. In particular, when high sealability is required, a contact type seal type rolling bearing is used in which a seal lip of a seal member is brought into contact with a sliding surface of an object member such as a raceway to seal a bearing space.
For example, patent document 1 describes a hub unit bearing in which a grease composition having a predetermined composition is enclosed as a sealed rolling bearing. The grease composition is said to be excellent in water resistance and the like by containing a base oil, a thickener, 3 rust inhibitors and an anti-wear agent.
Among them, grease leakage from the bearings may contaminate external mechanical parts. In addition, foreign matter such as water from the outside may be mixed in, which may significantly reduce the durability (wear resistance, bearing life) of the bearing. Therefore, it is important to ensure the sealability in the sealed rolling bearing. On the other hand, from the viewpoint of energy saving and resource saving, low torque is also required for sliding of the seal lip.
Conventionally, in order to keep the sliding resistance of a seal lip low and to ensure the sealing property of the seal lip, a technique of applying grease to the seal lip or a target member thereof has been known. For example, patent document 2 discloses a rolling bearing in which grease is applied in advance to a portion of a single side surface of a tip end portion of a seal lip, the portion being in sliding contact with a surface of a hub wheel when in use. Patent document 3 describes a rolling bearing in which grease is applied in advance to the surface of a target member in sliding contact with a seal lip.
Prior art literature
Patent literature
Patent document 1: japanese patent No. 5110843
Patent document 2: japanese patent No. 4475055
Patent document 3: japanese patent No. 4997532
Disclosure of Invention
Problems to be solved by the invention
In patent document 2, the shape of the seal member (the size of the seal lip, etc.) is studied to prevent the grease applied to the seal lip from peeling off in advance. Thereby, an increase in frictional resistance and a reduction in defective sealing are achieved. However, performance related to frictional resistance and sealability of the grease itself applied to the seal lip in advance is not considered. Therefore, the grease may have insufficient performance, thereby increasing frictional resistance and causing poor sealing. In addition, in patent document 3, the reduction of the rotational torque is achieved by defining the kinematic viscosity of the base oil of the grease, but it is considered that it is difficult to achieve both of the maintenance of the sealing property and the reduction of the rotational torque by defining only the kinematic viscosity of the base oil.
Conventionally, as in patent document 1, various grease compositions have been studied for grease compositions sealed in bearings, but little has been studied for grease applied to seal lips and members to be sealed.
For example, since a rolling bearing, a hub bearing, or the like used for an electric auxiliary machine of an automobile is likely to intrude into the bearing due to rainwater, water on a road, or the like, it is important to suppress intrusion of water and rust. However, the grease applied to patent documents 2 and 3 has not been studied for such characteristics.
In addition, for example, in the axle bearing, in order to improve traveling comfort and prevent poor sealing due to vibration, fluctuation of required torque is small. In addition, the axle bearing is required to be usable in a wide temperature range, assuming a temperature rise during high-speed running and use in cold regions. However, the characteristics required for such an axle bearing have not been studied in the grease applied in patent documents 2 and 3.
The present invention has been made in view of the above-described problems, and an object thereof is to provide a sealed rolling bearing capable of achieving both low torque and high sealing performance by improving grease applied to a seal lip and a target member thereof. Further, it is an object to provide a sealed rolling bearing which can have both high water resistance and rust resistance, and a sealed rolling bearing which can have both torque stability, high temperature resistance and low temperature resistance.
Means for solving the problems
The seal type rolling bearing of the present invention is a seal type rolling bearing comprising a seal member which seals and fixes a bearing space to a fixed side member and is in sliding contact with a rotating side member, wherein the seal member has a seal lip which is in sliding contact with the rotating side member, and a grease which contains a kinematic viscosity of 6mm at 40 ℃ is coated on at least one of a sliding contact surface of the seal lip and a sliding contact surface of the rotating side member which is in sliding contact with the seal lip 2 /s～45mm 2 The blending consistency of the base oil and the thickener according to JIS K2220 is 220-320.
The thickener is a urea compound obtained by reacting a polyisocyanate component with at least one monoamine component selected from aliphatic monoamines and alicyclic monoamines, or is a complex lithium soap.
Wherein the base oil is at least one selected from the group consisting of a synthetic hydrocarbon oil, an ester oil and an ether oil.
Wherein the base oil comprises only a synthetic hydrocarbon oil or a mixed oil of the synthetic hydrocarbon oil and an ester oil.
Characterized in that the base oil has a kinematic viscosity of 6mm at 40 DEG C 2 /s～20mm 2 And/s, wherein the mixing consistency is 220-270.
In one embodiment, the grease contains an anti-rust agent, and the mixing consistency is 220 to 280. The rust inhibitor is at least one selected from the group consisting of an ester rust inhibitor and a sulfonate rust inhibitor. The grease comprises an ester rust inhibitor and a sulfonate rust inhibitor as the rust inhibitors, wherein the rust inhibitors are contained in an amount of 0.5 mass% or more and less than 1.5 mass% relative to the total amount of the base oil and the thickener.
In one embodiment, the grease contains an antioxidant, and the antioxidant is contained in an amount of 0.1 mass% or more and less than 3 mass% relative to the total amount of the base oil and the thickener, and the mixing consistency is 240 to 300. The antioxidant is an amine antioxidant.
The seal member is formed of nitrile rubber, and has a first seal lip, a second seal lip, and a third seal lip in this order from the inner side of the bearing space as the seal lips, and the grease is applied to the sliding contact surfaces of the seal lips.
The sealed rolling bearing is a bearing for rotatably supporting an axle.
The seal type rolling bearing of the present invention is a seal type rolling bearing comprising a seal member which seals and fixes a bearing space to a fixed side member and is in sliding contact with a rotating side member, wherein the seal member has a seal lip which is in sliding contact with the rotating side member, a grease which contains a base oil, a thickener and an antioxidant is coated on at least one of a sliding contact surface of the seal lip and a sliding contact surface of the rotating side member which is in sliding contact with the seal lip, and a mixing consistency measured in accordance with JIS K2220 is 240 to 300, and the mixing consistency is 0.1 mass% or more and less than 3 mass% of the antioxidant relative to the total amount of the base oil and the thickener.
Effects of the invention
The sealed rolling bearing of the present invention comprises a sealing member fixed to a fixed side member and in sliding contact with a rotating side member, wherein at least one of the sliding contact surface of a sealing lip and the sliding contact surface of the rotating side member is coated with a grease containing a kinematic viscosity of 6mm at 40 DEG C 2 /s～45mm 2 Since the mixing consistency of the base oil and the thickener measured in accordance with JIS K2220 is 220 to 320, when the sliding contact surface of the seal lip and the sliding contact surface of the rotary member are coated, channeling (channeling) can be ensured, oil film breakage at low speed can be prevented, low torque can be achieved, and high sealing performance can be obtained.
The thickener is a urea compound obtained by reacting a polyisocyanate component with at least one monoamine component selected from aliphatic monoamines and alicyclic monoamines, or is a complex lithium soap, and thus contributes to further reduction in torque.
In one embodiment, the grease further contains an anti-rust agent and has a mixing consistency of 220 to 280, so that when the sliding contact surface of the seal lip and the sliding contact surface of the rotating side member are coated, the grease can ensure a satisfactory groove flow property, achieve a low torque, and achieve high water resistance and anti-rust properties. Further, since the grease contains the ester-based rust inhibitor and the sulfonate-based rust inhibitor as rust inhibitors, and contains 0.5 mass% or more and less than 1.5 mass% of the rust inhibitor relative to the entire grease, the grease exhibits excellent rust inhibition properties, and the shape of the grease is easily maintained even when the grease is in contact with water, and the water resistance can be improved.
In one embodiment, the grease further contains 0.1 mass% or more and less than 3 mass% of an antioxidant, and the mixing consistency is 240 to 300, so that the sealing member is excellent in low torque, torque stability, high temperature resistance and low temperature resistance, and the function (fuel consumption) of the sealed rolling bearing sealed with the seal is improved.
The sealing member is formed of nitrile rubber, and has 3 sealing lips as sealing lips in this order from the inner side of the bearing space, and the sliding contact surfaces of these sealing lips are coated with grease, so that the sealing performance can be further improved while ensuring low torque performance.
The sealed rolling bearing is a bearing that rotatably supports an axle, and thus can contribute to higher functionality (lower fuel consumption) of an axle bearing such as a hub bearing.
The seal type rolling bearing of the present invention comprises a seal member fixed to a fixed side member and in sliding contact with a rotating side member, wherein a grease containing a base oil, a thickener and an antioxidant is coated on at least one of a sliding contact surface of a seal lip and a sliding contact surface of the rotating side member, and the mixing consistency measured in accordance with JIS K2220 is 240 to 300 because the grease contains 0.1 mass% or more and less than 3 mass% of the antioxidant relative to the total amount of the base oil and the thickener, and therefore the seal member is excellent in low torque, torque stability, high temperature resistance and low temperature resistance, resulting in high function (fuel consumption) of the seal type rolling bearing sealed with the seal.
Drawings
Fig. 1 is a longitudinal sectional view showing an example of a sealed rolling bearing of the present invention.
Fig. 2 is an enlarged sectional view showing the bearing sealing device of the inner side of fig. 1.
Fig. 3 is an enlarged sectional view showing the bearing sealing device of the outer side of fig. 1.
Fig. 4 is a longitudinal sectional view showing another example of the sealed rolling bearing of the present invention.
Fig. 5 is an enlarged sectional view of the sealed rolling bearing of fig. 4.
Fig. 6 is a schematic diagram showing a method of manufacturing grease.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a longitudinal sectional view of a hub bearing as an example of a sealed rolling bearing according to the present invention. The hub bearing 1 shown in fig. 1 is an axle bearing that rotatably supports a drive wheel side of an axle.
As shown in fig. 1, the hub bearing 1 integrally includes a body mounting flange 2b that is mounted on a body (not shown) at an outer periphery thereof, an outer member 2 that has a plurality of outer raceway surfaces 2a, 2a formed at an inner periphery thereof, and a wheel mounting flange 4b that has a wheel (not shown) mounted at one end thereof, and includes an inner raceway surface 4a formed at an outer periphery thereof on a side opposite to the plurality of outer raceway surfaces 2a, a cylindrical small diameter stepped portion 4c that extends in an axial direction from the inner raceway surface 4a, and a hub ring 4 that has a serration portion 6 formed at an inner periphery thereof for torque transmission; and an inner ring 5 press-fitted with a small diameter step portion 4c and having an inner raceway surface 5a on the other side formed on the outer periphery.
Between the outer raceway surfaces 2a, 2a of the plurality of rows and the inner raceway surfaces 4a, 5a facing the outer raceway surfaces, a plurality of rows of rolling elements (balls) 7 are accommodated so as to be freely rolling by a cage 8. In addition, bearing seals 11 and 16 are respectively attached to annular spaces formed between an inner member 3, which is a rotation side member, and an outer member 2, which is a fixed side member, which are formed by a hub wheel 4 and an inner ring 5, so as to prevent leakage of a grease composition enclosed in the bearing space 9 and entry of rainwater, dust, and the like into the bearing space 9 from the outside. Of these bearing seals 11, 16, the bearing seal 11 on the inner side (right side in the drawing) mounted between the outer member 2 and the inner ring 5 will be described with reference to fig. 2.
As shown in fig. 2, the bearing seal device 11 is embedded in the outer member 2, and includes a seal ring 14 composed of a plug 12 formed in an L-shaped cross section and a seal member 13 integrally vulcanization-bonded to the plug 12, and a slinger 15 externally embedded in the inner ring 5 and also formed in an L-shaped cross section. The slinger 15 and the plug 12 of the seal ring 14 are formed by press working an austenitic stainless steel sheet (SUS 304 series of J IS standard, etc.) or a rust-proof cold rolled steel sheet (SPCC series of JIS standard, etc.).
As a material of the sealing member 13, nitrile rubber (NBR), acrylic rubber, silicone rubber, fluororubber, or the like is used. In fig. 2, the seal member 13 has 3 inner, intermediate, and outer seal lips 13a, 13b, 13c in this order from the inner side of the bearing space, the front end edge of the outer seal lip 13c is brought into sliding contact with the inner side surface of the riser portion 15b of the slinger 15, and the front end edges of the remaining intermediate seal lip 13b and inner seal lip 13a are brought into sliding contact with the cylindrical portion 15a of the slinger 15. In this configuration, the plug 12 corresponds to a fixed-side member, and the slinger 15 corresponds to a rotating-side member.
In the configuration of fig. 2, grease is applied to the sliding contact surface of the seal lip of the seal member. Specifically, as shown in fig. 2, grease G is applied to the sliding contact surfaces of the seal lips 13a, 13b, 13c that are in sliding contact with the slinger 15. In this case, the grease G may be applied to at least the sliding contact surface of the seal lip, or may be applied to the entire seal lip. In the present invention, grease G is characterized by comprising a base oil and a thickener, and having a mixing consistency in the range of 220 to 320. The grease will be described below.
The base oil used for the grease can be a general base oil used in the field of grease. Examples thereof include mineral oils such as paraffin-based mineral oils, naphthene-based mineral oils, and the like, poly-alpha-olefin (PAO) oils, alkylbenzene oils, alkyl naphthalene oils, polyphenyl oils, synthetic hydrocarbon oils (nonpolar oils) such as synthetic naphthene oils and polybutene oils, ester oils, ether oils, silicone oils, fluorine oils, and the like. These base oils may be used alone or in combination of 2 or more.
Among the above, the base oil is preferably at least one selected from the group consisting of a synthetic hydrocarbon oil, an ester oil and an ether oil, more preferably the base oil is a synthetic hydrocarbon oil alone, a mixed oil of a synthetic hydrocarbon oil and an ester oil, or a mixed oil of a synthetic hydrocarbon oil and an ether oil, and still more preferably the base oil is a synthetic hydrocarbon oil alone or a mixed oil of a synthetic hydrocarbon oil and an ester oil. In the case of using a mixed oil containing a synthetic hydrocarbon oil as a base oil, the synthetic hydrocarbon oil is preferably 60% by mass or more, more preferably 65% by mass to 90% by mass of the entire base oil (mixed oil).
The PAO oil as a synthetic hydrocarbon oil is an alpha-olefin or a mixture of oligomers or polymers of isomerized alpha-olefins. Specific examples of the α -olefin include 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, and 1-tetracene, and a mixture thereof is usually used.
Examples of the ester oil include diester oils such as dibutyl sebacate, di-2-ethylhexyl sebacate and dioctyl adipate, aromatic ester oils such as trioctyl trimellitate, tetraoctyl pyromellitate and the like, polyol ester oils such as trimethylolpropane octanoate, trimethylolpropane nonanoate and pentaerythritol ester oil, carbonate oil and phosphate ester oil. Among these, pentaerythritol ester oil is preferable.
The base oil used in the grease has a kinematic viscosity at 40 ℃ (in the case of a mixed oil, the kinematic viscosity of the mixed oil, the same applies hereinafter) of, for example, 6mm from the viewpoint of preventing oil film break at low speed and torque reduction 2 /s～45mm 2 S, preferably 6mm 2 /s～31mm 2 S, more preferably 6mm 2 /s～20mm 2 S, more preferably 7mm 2 /s～17mm 2 S, particularly preferably 9mm 2 /s～17mm 2 /s。
The thickener used in the grease is not particularly limited, and a general thickener used in the field of general grease can be used. For example, a soap-based thickener such as a metal soap or a complex metal soap, a non-soap-based thickener such as bentonite, silica gel, a diurea compound, a triurea compound, a tetraurea compound, and a urea-urethane compound may be mentioned. Examples of the metal soaps include sodium soaps, calcium soaps, and lithium soaps, and examples of the complex metal soaps include complex lithium soaps. Among these, a diurea compound or a complex lithium soap is preferably used, and a diurea compound is more preferably used.
The biuret compound is obtained by reacting a polyisocyanate component with a monoamine component. Examples of the polyisocyanate component include phenylene diisocyanate, toluene diisocyanate, diphenyl diisocyanate, diphenylmethane diisocyanate, octadecane diisocyanate, decane diisocyanate, hexane diisocyanate, and the like. In addition, aliphatic monoamines, alicyclic monoamines, and aromatic monoamines can be used as the monoamine component. Examples of the aliphatic monoamine include hexylamine, octylamine, dodecylamine, hexadecylamine, octadecylamine, stearylamine, and oleylamine. Examples of the alicyclic monoamine include cyclohexylamine and the like. As the aromatic monoamine, aniline, p-toluidine and the like can be mentioned.
Among these diurea compounds, aromatic diisocyanate is preferably used as the polyisocyanate component and at least one of aliphatic monoamine and alicyclic monoamine is preferably used as the monoamine component, as shown in examples described later. In particular, an aliphatic/alicyclic diurea compound produced using an aromatic diisocyanate as a polyisocyanate component and an aliphatic monoamine and an alicyclic monoamine having 6 to 12 carbon atoms as a monoamine component is more preferably used as a thickener. The ratio of the aliphatic monoamine to the alicyclic monoamine used for producing the aliphatic-alicyclic diurea compound is not particularly limited, and the aliphatic monoamine is preferably a molar ratio: alicyclic monoamine= (3:1) to (1:3), and the molar ratio is more preferably (2:1) to (1:2).
The base grease containing a diurea compound as a thickener is produced by reacting the polyisocyanate component with a monoamine component in a base oil.
The composite lithium soap is synthesized from lithium hydroxide, aliphatic monocarboxylic acid, aliphatic dicarboxylic acid, and other dibasic acids. Examples of the aliphatic monocarboxylic acid include stearic acid, 12-hydroxystearic acid, and 16-hydroxypalmitic acid. Examples of aliphatic dicarboxylic acids include azelaic acid, sebacic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, undecanedioic acid, dodecanedioic acid, and the like.
In the composite lithium soap, it is preferable to use a fatty acid monocarboxylic acid having 10 or more carbon atoms in combination with a fatty acid dicarboxylic acid having less than 10 carbon atoms. In particular, 12-hydroxystearic acid is more preferable as a fatty acid monocarboxylic acid having 10 or more carbon atoms, and azelaic acid is more preferable as a fatty acid dicarboxylic acid having less than 10 carbon atoms.
In the grease used in the present invention, the thickener is preferably contained in an amount of 10 to 30% by mass, more preferably 10 to 20% by mass, still more preferably 12 to 18% by mass, and may be 15 to 20% by mass, based on the total amount (100% by mass) of the base oil and the thickener. By making the amount of the thickener smaller, the proportion of the base oil can be increased correspondingly, and the torque can be easily reduced.
The grease used in the present invention has a mixing consistency (JIS K2220) in the range of 220 to 320. As shown in examples described later, the grease is preferably in a slightly hard state from the viewpoint of sealing property. Specifically, the mixing consistency is preferably in the range of 220 to 270, more preferably in the range of 220 to 250.
A particularly preferred form of the grease comprises: kinematic viscosity at 40℃of 6mm 2 /s～20mm 2 And a urea compound obtained by reacting a polyisocyanate component with at least one monoamine component selected from aliphatic monoamines and alicyclic monoamines, wherein the base oil contains at least a synthetic hydrocarbon oil, and the grease has a mixing consistency in the range of 220 to 270.
In the grease, a known additive may be added as necessary. Examples of the additives include antioxidants such as amine-based, phenol-based, and sulfur-based compounds, and rust inhibitors such as polyol esters. It is preferable that the extreme pressure agent such as an organozinc compound or an organomolybdenum compound is not contained.
In addition, as one embodiment of the grease used in the present invention, the grease contains a rust inhibitor in addition to the base oil and the thickener.
The amount of the rust inhibitor is preferably 0.5% by mass or more and less than 3.0% by mass based on the whole (100% by mass) of the base grease composed of the base oil and the thickener. Within this range, rust inhibitive performance is exhibited, and the shape of the grease is easily maintained even when in contact with water. The amount of the rust inhibitor is more preferably 0.5% by mass or more and less than 1.5% by mass based on the entire base grease.
The type of rust inhibitor is not particularly limited, and ester rust inhibitors can be used; sulfonate rust inhibitors; carboxylic acid rust inhibitors such as linear fatty acids such as lauric acid and stearic acid, succinic acid and alkyl succinic acid; carboxylate rust inhibitors such as metal salts (cobalt, manganese, zinc) of fatty acids and naphthenic acids; amine rust inhibitors such as alkoxyphenyl amine. Among these rust inhibitors, at least one selected from the group consisting of ester-based rust inhibitors and sulfonate-based rust inhibitors is preferably used.
As the ester-based rust inhibitor, a partial ester of a polyhydric alcohol such as sorbitol anhydride, sorbitol, pentaerythritol, sucrose, glycerin, etc., and a carboxylic acid such as oleic acid, lauric acid, etc., a succinic acid half ester such as alkyl succinic acid half ester, alkenyl succinic acid half ester, etc., can be used. These ester rust inhibitors may be used alone or in combination of 2 or more.
Among the above-mentioned ester rust inhibitors, sorbitan fatty acid esters are more preferable. Examples of the sorbitan fatty acid ester include sorbitan fatty acid monoesters such as sorbitan monolaurate, sorbitan monostearate and sorbitan monooleate, and sorbitan trioleate. When the ester-based rust inhibitor is used, the amount of the ester-based rust inhibitor is preferably less than 1% by mass based on the entire base grease.
As the sulfonate-based rust inhibitor, various metal salts and amine salts of petroleum-based sulfonic acid obtained by sulfonating an aromatic component of a petroleum distillate component, such as alkyl aromatic sulfonic acid such as alkylbenzenesulfonic acid and alkylnaphthalene sulfonic acid, can be used. Examples of the metal constituting the metal salt include alkaline earth metals such as barium, calcium, and magnesium, alkali metals such as sodium and lithium, and zinc. Examples of amines constituting the amine salt include ethylamine and trimethylamine. These sulfonate-based rust inhibitors may be used alone or in combination of 2 or more.
In particular, as the rust inhibitor, an ester-based rust inhibitor and a sulfonate-based rust inhibitor are preferably used in combination. By combining these 2 rust inhibitors, the rust inhibitive performance can be improved as compared with the case of using 1 type of rust inhibitive agent alone.
When the rust inhibitor is contained, the mixing consistency (JIS K2220) of the grease is preferably in the range of 220 to 280, more preferably in the range of 240 to 280.
Particularly preferred forms of grease comprising rust inhibitors are: comprising a kinematic viscosity at 40℃of 6mm 2 /s～20mm 2 Base oil of/s, a thickener comprising a polyisocyanate component and at least one selected from aliphatic monoamines and alicyclic monoaminesThe urea compound obtained by reacting the monoamine component (A) with an ester rust inhibitor and a sulfonate rust inhibitor as rust inhibitors, and the grease has a mixing consistency in the range of 220 to 280. Further, in this case, the amount of the rust inhibitor to be blended is preferably 0.5% by mass or more and less than 1.5% by mass based on the entire base grease.
In another embodiment of the grease used in the present invention, the grease contains an antioxidant in addition to the base oil and the thickener.
The amount of the antioxidant to be blended is 0.1% by mass or more and less than 3% by mass based on the whole base grease (100% by mass) composed of the base oil and the thickener. In this range, oxidation degradation of the grease can be suppressed, and torque fluctuation during bearing rotation can be suppressed. The amount of the antioxidant to be blended is preferably 0.5 mass% or more and less than 3 mass%, more preferably 0.5 mass% or more and 2 mass% or less, based on the whole base grease.
Examples of the antioxidant include amine antioxidants such as phenyl-1-naphthylamine, phenyl-2-naphthylamine, diphenyl-p-phenylenediamine, dipyridylamine, phenothiazine, N-methylphenothiazine, N-ethylphenothiazine, 3, 7-dioctylphenothiazine, p ' -dioctyldiphenylamine, N ' -diisopropylp-phenylenediamine, and phenol antioxidants such as 2,2' -methylenebis (6-t-butyl-4-methylphenol). These antioxidants may be used alone or in combination of 2 or more. As the antioxidant, an amine-based antioxidant is preferably used.
When the antioxidant is contained, the mixing consistency (JIS K2220) of the grease is preferably in the range of 240 to 300, and more preferably in the range of 240 to 280 from the viewpoint of further suppressing torque fluctuation as shown in examples described later.
Particularly preferred forms of grease comprising an antioxidant are: comprising a kinematic viscosity at 40℃of 6mm 2 /s～20mm 2 Base oil of/s, urea compound obtained by reacting polyisocyanate component with at least one monoamine component selected from aliphatic monoamine and alicyclic monoamine as thickener, and amine-based anti-aging agentAn oxidizing agent, wherein the amount of the oxidizing agent to be blended is 0.1 mass% or more and 2 mass% or less with respect to the whole base grease, and the mixing consistency of the grease is in the range of 240 to 300.
The grease used in the present invention may contain the rust inhibitor and the antioxidant in combination.
Next, the bearing seal device 16 will be described with reference to fig. 3. The bearing seal device 16 is embedded in the outer member 2, and is composed of a mandrel 17 formed in an annular shape and a seal member 18 integrally vulcanization-bonded with the mandrel 17. The plug 17 is formed in the same manner as the slinger described above. The seal member 18 is made of an elastic member such as nitrile rubber, and includes 2 side lips (dust seals) 18b and 18c and a single radial lip (grease seal) 18a, and has the tip end edges thereof in direct sliding contact with a sliding contact surface 19 formed in an arc shape on the surface of the hub wheel 4, specifically, on the inner side base portion of the wheel mounting flange 4 b.
As shown in fig. 3, in the bearing seal device 16, the surfaces of the seal lips 18a, 18b, 18c that are in sliding contact with the hub wheel 4, specifically, the one side surfaces of the tip portions of the seal lips are coated with grease G. This achieves both of ensuring the sealing performance and reducing the rotational torque.
Fig. 4 is a longitudinal sectional view of a deep groove ball bearing as another example of the sealed rolling bearing of the present invention, and fig. 5 is a partially enlarged view thereof. The rolling bearing 21 has an inner ring 22 having an inner ring raceway surface on an outer peripheral surface and an outer ring 23 having an outer ring raceway surface on an inner peripheral surface, and a plurality of rolling elements 24 are disposed between the inner ring raceway surface and the outer ring raceway surface. The rolling elements 24 are held by a cage 25. Bearing seals 27 are attached to both axial end openings of the inner and outer rings, and a grease composition 26 is sealed around at least the rolling elements 24. The inner ring 22, the outer ring 23, and the rolling elements 24 are made of an iron-based metal material, and the grease composition 26 is present on the raceway surface of the rolling elements 24 for lubrication.
As shown in fig. 5, the bearing sealing device 27 is composed of a disk-shaped plug 28 formed by press working a cold-rolled steel sheet or the like, and a sealing member 29 integrally vulcanization-bonded with the plug 28. The seal member 29 has a main lip 29a formed by branching the distal end into two strands and a dust lip 29b located outside the bearing space than the main lip 29a at the end of the inner ring 22 side. The seal member 29 is partially fixed to a seal groove formed in the inner periphery of the end portion of the outer ring 23 as a fixed-side member, and each seal lip is in sliding contact with a seal groove or the like formed in the outer periphery of the end portion of the inner ring 22 as a rotating-side member and having a substantially U-shaped cross section. As shown in fig. 5, in the bearing seal device 27, the surfaces of the seal lips 29a and 29b that slide against the inner ring 22, specifically, the one side surfaces of the tip portions of the seal lips are coated with grease G.
In the examples of fig. 4 to 5, the deep groove ball bearing is exemplified as the seal type rolling bearing, but the bearing seal device of the present invention can be used as a cylindrical roller bearing, a tapered roller bearing, a self-aligning roller bearing, a needle roller bearing, a thrust cylindrical roller bearing, a thrust tapered roller bearing, a thrust needle roller bearing, a thrust self-aligning roller bearing, or the like other than the above.
In the sealed rolling bearing shown in fig. 1 to 5, the grease used in the present invention may be applied to the surface of the seal lip of the rotating member in sliding contact with the seal lip, instead of or in addition to the sliding contact surface of the seal lip.
The application of the sealed rolling bearing of the present invention is not particularly limited, and as shown in examples described later, the sealed rolling bearing is particularly suitable for low-speed rotation because it can prevent oil film break even in low-speed rotation and has low torque. The sealed rolling bearing of the invention is applied to, for example, 2000 minutes -1 The following rotation speed ranges are used as bearings. Wherein, at 2000 minutes -1 The following rotation speed range is used to mean that the main rotation speed (steady state rotation speed) of the bearing in use state is 2000 minutes -1 The following is given. The rotational speed may be 1500 minutes -1 Hereinafter, the time may be 1000 minutes -1 The following is given.
Examples
Test example A
First, greases having compositions shown in tables 1 to 3 were prepared. In tables 1 to 3, the mass% of the base oil and the thickener represents the content ratio with respect to the base grease (base oil+thickener). Tables 1) to 8) shown below are also the same as tables 2 and 3.
Grease using a diurea compound as a thickener (other than test example A5) was prepared as shown in fig. 6 (a).
First, an oil phase a in which half of the isocyanate (4, 4' -diphenylmethane diisocyanate, MDI) and the base oil were mixed at 60 ℃ and an oil phase B in which half of the amine and the base oil were mixed at a prescribed temperature (room temperature to 60 ℃) were prepared. Next, while stirring the oil phase a, the oil phase B was added and mixed, and heated at 100 ℃ for 30 minutes (urea reaction). The completion of the reaction was confirmed by IR (infrared spectroscopic device) or the like. Then, the reaction mixture was heated at 130℃for 1 hour (stabilization of the reaction) and cooled slowly to room temperature. Then, homogenization treatment was performed, and the grease was smoothed by a triple roll mill. Fig. 6 (b) is a photomicrograph of the resulting grease.
Grease using a complex lithium soap as a thickener (test example A5) was prepared as follows.
First, 12-hydroxystearic acid was put in a half amount of base oil, heated to 90 ℃, and a substance obtained by diluting lithium hydroxide with water about 10 times was added thereto. Then, a nonionic surfactant was added and stirred vigorously. Then, azelaic acid was added and stirred, and a substance obtained by diluting lithium hydroxide with water about 10 times was added thereto in portions and stirred for about 30 minutes. The completion of the reaction was confirmed by IR (infrared spectroscopic device) or the like. Then, an antioxidant was added, and after heating to 180 ℃, the remaining base oil was added and allowed to cool until room temperature was reached. Then, homogenization treatment was performed, and the grease was smoothed by a triple roll mill.
For the obtained grease, the mixing consistency (JIS K2220) was measured.
The obtained grease was applied to one side surface of the tip portions of 3 seal lips of a nitrile rubber seal member (60 to 70 mm). The seal member was attached to a member simulating the hub outer ring, and a slinger made of SUS430 was attached to a member simulating the hub inner ring, and the seal lip was assembled so as to be in contact with the slinger.
< test of sealing Torque >)
Set to 600 minutes of rotation speed -1 Or a rotational speed of 50 minutes -1 After 15 minutes from the start of the test, the torque (n·m) generated by the sliding contact of the seal lip was measured. In this test, at a rotational speed of 600 minutes -1 In the case of (2), 0.20 or more is determined to be unacceptable.
Torque variation test
At a rotational speed of 50 minutes -1 The member simulating the inner ring of the hub was rotated for 15 minutes in an atmosphere at room temperature. The seal member was brought into sliding contact with a slinger (object material) made of SUS 430. The torque (n·m) generated by sliding contact between the seal lip and the slinger was measured, and the difference between the maximum and minimum torque values was obtained for the last 5 minutes. The difference (torque fluctuation) between them was marked as "excellent", 0.01n·m or more and less than 0.02n·m was marked as "good", and 0.02n·m or more was marked as "x", and they are all shown in tables 1 to 3.
< test for leakage of grease >)
A sealing member made of nitrile rubber was attached to a seal groove formed on the outer periphery of the inner ring of the deep groove ball bearing 6204 by applying 0.4g of the grease obtained above so that the seal lip was in contact with the seal groove.
The test bearings were fixed at 5000 minutes of revolution -1 The grease leakage rate during 24 hours operation was measured at 80℃by applying an axial load 640N and a radial load 67N to the outer ring and restraining the outer ring with a load cell as the inner ring rotation. The leak rate was calculated by the following formula. Before the operation, 0.05g of a known grease composition (composition different from the grease prepared in tables 1 to 3) was sealed in the bearing space.
Leakage rate (mass%) = ((weight of bearing before operation-weight of bearing after operation)/(weight of bearing before operation)) ×100
The evaluation of the leakage rate was carried out by marking less than 8 mass%, marking no less than 8 mass% and less than 13 mass%, marking no less than 13 mass%, and the results are shown in tables 1 to 3.
TABLE 1
1)5mm 2 s@40deg.C (day iron chemistry)&Material, and a packing box 201
2)17mm 2 s@40deg.C (day iron chemistry)&Material, and a packing box 401
3)31mm 2 s@40deg.C (day iron chemistry)&Material, and a packing box 601
4)47mm 2 s@40deg.C (day iron chemistry)&Material, and a packing 801
5)16mm 2 s@40deg.C (flower king, body 162)
6)31mm 2 s@40deg.C (flower king, body case 262)
7)16mm 2 s@40deg.C (produced by MORESCO, a third drive LB-15)
8) 12-hydroxystearic acid+lithium hydroxide+azelaic acid
TABLE 2
TABLE 3
As shown in tables 1 to 3, the composition used had a kinematic viscosity of 6mm at 40 ℃ 2 /s～45mm 2 Test examples A1 to A20, in which the grease having a consistency of 220 to 320 was mixed with the base oil and the thickener per second, showed good results in all the tests.
From the results of tables 1 to 3, the base oil had a kinematic viscosity at 40℃of 6mm 2 /s～45mm 2 When the kinematic viscosity decreases in the range of/sIn the seal torque test, a tendency to exhibit a lower torque was observed (test examples a10 to a14, etc.). On the other hand, test example A22 (kinematic viscosity 47mm 2 In/s), a rise in torque is confirmed. In addition, in test example A21 (kinematic viscosity 5mm 2 In/s), although good results were obtained in the seal torque test, the result was a large leakage of grease in the grease leakage test. The reason is considered to be that the grease is soft due to its high consistency.
From the results of the torque fluctuation test and the grease leakage test, it is known that, in particular, the consistency of the grease is affected. For example, in the test examples A6 to A9, the test examples a15 to a18 and the test examples a23 to a26, the kinematic viscosity of the base oil was the same, but in the test examples a24 to a26 having a consistency exceeding 320, the torque fluctuation was large and the leakage of the grease was increased, and in the test examples A6 to A9 and the test examples a15 to a18 having a consistency of 320 or less, good results were obtained. Further, as the consistency becomes smaller, the leak rate and the like are increased. It is believed that as the consistency decreases, the grease becomes somewhat stiff, resulting in high leakage. On the other hand, in test example a23, although the consistency was small and high leakage was exhibited, the torque variation was large.
In test example a, it can be said from the results of tables 1 to 3 that, in order to reduce the sealing torque, it is preferable to use a base oil having a low kinematic viscosity, and on the other hand, it is a problem to obtain a slightly hard grease. In this regard, by combining an appropriate thickener and a kind of base oil, it is possible to bring the consistency to an appropriate numerical range while using a base oil of low viscosity. Specifically, the low viscosity base oil (synthetic hydrocarbon oil alone, mixed oil of synthetic hydrocarbon oil and ester oil, or mixed oil of synthetic hydrocarbon oil and ether oil) is combined with the thickener (aliphatic diurea compound, alicyclic diurea compound, aliphatic alicyclic diurea compound) to bring the consistency to a desired numerical range.
Test example B
Greases having compositions shown in tables 4 to 6 were prepared. In tables 4 to 6, the mass% of the base oil, the thickener and the rust inhibitor shows the content ratio with respect to the base grease (base oil+thickener). Tables 1) to 9) shown in Table 4 are also the same as those shown in tables 5 and 6.
Each grease was produced as shown in fig. 6 (a) in the same manner as in test example a.
For the obtained grease, the mixing consistency (JIS K2220) was measured.
< test of sealing Torque >)
The resultant grease was applied to one side surface of the tip portions of 3 seal lips of a nitrile rubber seal member (. Phi.60 to 70 mm) in total of 0.6 g. The seal member was attached to a member simulating the hub outer ring, and a slinger made of SUS430 was attached to a member simulating the hub inner ring, and the seal lip was assembled so as to be in contact with the slinger.
Set to 600 minutes of rotation speed -1 After 30 minutes from the start of the test, the torque (n·m) generated by the sliding contact of the seal lip was measured for 1 minute. In this test, 0.20 or more was determined to be unacceptable.
< Water resistance test >)
A sealing member made of nitrile rubber was attached to a sealing groove formed on the outer periphery of the inner ring and the inner periphery of the outer ring of the 6204 stainless steel bearing by applying 0.4g of the grease in total so that the sealing lip was in contact with the sealing groove of the inner ring. A known grease composition (composition different from the grease prepared in tables 4 to 6) was sealed in the bearing space by 0.05 g. The following test was performed using the test bearing, with the water-washing resistance test specified in JIS K2220 being changed.
After the test bearing was assembled in the housing of the water-washed water tolerance tester, the test bearing was immersed in warm water at 79 ℃. Then, the test bearing was immersed in water at a rotational speed of 600 minutes -1 While rotating, hot water at 79℃was sprayed from the spray nozzle into the test bearing for 120 minutes with a water amount of 6 ml/s. After the test, the water intrusion into the test bearing was determined by the following formula.
Water intrusion amount (g) = (weight of bearing after operation-weight of bearing before operation)
For the evaluation of the water intrusion amount, less than 0.5g was marked as excellent, 0.5g or more and less than 1.0g was marked as good, and 1.0g or more was marked as X, and they are shown in tables 4 to 6.
< Rust test >)
The tapered roller bearing coated with the grease was immersed in 1 mass% brine for 10 seconds, and allowed to stand in a high-humidity environment. After the test, the bearing was taken out, and the outer ring rolling surface was visually observed. For evaluation, the outer ring rolling surface was divided into 32 areas, and the rust ratio was calculated by how many of the areas were rusted.
And (3) bearing: 4T-30204
Grease sealing amount: 2.1g
Test temperature: 40 DEG C
Test humidity: 100% RH
Test time: 48 hours
For the evaluation of the rust rate, less than 25% was marked as excellent, 25% or more and less than 75% was marked as good, and 75% or more was marked as good, and they are shown in tables 4 to 6.
TABLE 4
1)5mm 2 s@40deg.C (day iron chemistry)&Material, and a packing box 201
2)17mm 2 s@40deg.C (day iron chemistry)&Material, and a packing box 401
3)31mm 2 s@40deg.C (day iron chemistry)&Material, and a packing box 601
4)47mm 2 s@40deg.C (day iron chemistry)&Material, and a packing 801
5)16mm 2 s@40deg.C (flower king, body 162)
6)31mm 2 s@40deg.C (flower king, body case 262)
7) Fuji film and light pure medicine preparation
8) Fuji film and light pure medicine preparation
9) King Industries, NA-SUL ZS
TABLE 5
TABLE 6
As shown in tables 4 to 5, a composition containing a kinematic viscosity at 40℃of 6mm was used 2 /s～45mm 2 Test examples B1 to B16, in which the base oil, the thickener and the rust inhibitor were/s and the grease had a mixed consistency of 220 to 280, showed good results in all the tests.
From the results of tables 4 to 6, the base oil had a kinematic viscosity at 40℃of 6mm 2 /s～45mm 2 When the kinematic viscosity was lowered in the range of/s, a tendency to exhibit a lower torque was observed in the seal torque test (test example B1, test examples B14 to B16). On the other hand, in test example B20 (kinematic viscosity 47mm 2 In/s), the rise in torque was confirmed.
The result of the water penetration amount (water resistance) shows that the mixing consistency of grease and the blending amount of rust inhibitor are particularly affected. Both of test examples B17 and B18 having a mixing consistency outside the range of 220 to 280 showed an increase in the water intrusion amount. Test example B18 (mixed consistency 300) was considered to be soft because of its high consistency, and therefore grease flowed out from the vicinity of the seal lip, and as a result, the sealability was lowered. On the other hand, test example B17 (mixing consistency 200) was considered to be hard and poor in fluidity, and therefore, gaps were likely to occur, and sealability was lowered.
When the blending amount of the rust inhibitor was increased, a tendency of increasing the water intrusion amount was observed (test examples B4 to B5 and test examples B9 to B10). The rust inhibitor is effective from the viewpoint of rust inhibition, but from the viewpoint of sealability of grease against the intrusion of water, there is a possibility that the rust inhibitor may adversely act. It is presumed that the grease is easily made hydrophilic by increasing the amount of the rust inhibitor to be blended, and it is difficult to maintain the shape of the grease existing in the vicinity of the seal lip.
The rust inhibitive performance was improved when the ester rust inhibitive agent and the sulfonate rust inhibitive agent were used in combination, compared with the case where the ester rust inhibitive agent and the sulfonate rust inhibitive agent were used alone (test examples B3 to B8).
In test example B, from the results of tables 4 to 6, by combining the proper consistency and viscosity of the base oil with the proper rust inhibitor (in particular, the combination of the ester-based rust inhibitor and the sulfonate-based rust inhibitor), the groove flow property can be ensured, the torque can be reduced, and the high water resistance and rust resistance can be obtained. In addition, since it is easy to set the consistency to an appropriate numerical range while using a base oil having a low viscosity, in this test, a predetermined base oil (synthetic hydrocarbon oil alone, mixed oil of synthetic hydrocarbon oil and ester oil) and a predetermined thickener (aliphatic/alicyclic diurea compound) are combined.
Test example C
Greases having compositions shown in tables 7 to 8 were prepared. In tables 7 to 8, the mass% of the base oil, the thickener and the antioxidant is expressed as the content of the base grease (base oil+thickener). Table 7 is the same as tables 1) to 4) below.
Each grease was produced as shown in fig. 6 (a) in the same manner as in test example a.
For the obtained grease, the mixing consistency (JIS K2220) was measured.
The resulting grease (0.6 g) was applied to one side surface of the tip portions of 3 seal lips of a nitrile rubber seal member (. Phi.60 to 70 mm). The seal member was attached to a member simulating the outer ring of the hub, and a slinger made of SUS430 was attached to a member simulating the inner ring of the hub, so that the seal lip was in contact with the slinger.
< Torque variation test 1 >)
At a rotational speed of 1000 minutes -1 The member simulating the inner ring of the hub was rotated for 30 minutes in an atmosphere at room temperature. The seal member was brought into sliding contact with a slinger (object material) made of SUS 430. The torque (n·m) generated by sliding contact between the seal lip and the slinger was measured, and the difference between the maximum and minimum torque values was obtained for the last 5 minutes. A difference (torque variation) of less than 0.01 N.m is marked as excellent, and a difference of 0.01 N.m or more and less than 0.02 N.m is marked as good The marks of 0.02 N.m or more are marked X and are shown in tables 7 to 8.
< Torque variation test 2 >)
At a rotational speed of 50 minutes -1 The member simulating the inner ring of the hub was rotated for 15 minutes in an atmosphere at room temperature. The seal member was brought into sliding contact with a slinger (object material) made of SUS 430. The torque (n·m) generated by sliding contact between the seal lip and the slinger was measured, and the difference between the maximum and minimum torque values was obtained for the last 5 minutes. The difference (torque variation) between them was marked as "excellent" when the difference was less than 0.01 N.m, marked as "good" when the difference was not less than 0.01 N.m and less than 0.02 N.m, marked as "X" when the difference was not less than 0.02 N.m, and the results are shown in tables 7 to 8.
< test of high temperature resistance >)
And evaluating the high temperature resistance of each lubricating grease by adopting oxidation induction time. Oxidation induction time was measured using high Pressure Differential Scanning Calorimeter (PDSC). The PDSC is a measurement method in which differential scanning calorimetric measurement is performed under pressure, and in this PDSC, the period of time from when the sample reaches a predetermined temperature to when oxidation starts is measured. The test piece grease (3 mg) was pressurized to 3.5MPa under an oxygen atmosphere, the test temperature was set at 220℃and the time (oxidation induction time) from the time when the test piece temperature reached 220℃to the oxidation heat generation peak was measured. The oxidation induction time was marked with a mark @ 30 minutes or more, the oxidation induction time was marked with a mark @ 10 minutes or more and less than 30 minutes, and the oxidation induction time was marked with a mark ×lessthan 10 minutes, and the oxidation induction times are shown in tables 7 to 8.
< test of Low temperature resistance >
The low temperature resistance of each grease was evaluated by using the storage modulus. Parallel plate rheometers were used in the experiments. Grease was placed on a lower plate having a diameter of 25mm, and an upper plate having a diameter of 25mm was used to hold the grease from above and below, with a gap of 1mm between the plates. The storage modulus of the grease was measured at a temperature of-40℃and a frequency of 1Hz, and the strain amount was 0.001. Tables 7 to 8 show that the storage modulus was marked with good results, that 200kPa or more and less than 250kPa were marked with good results, that 250kPa or more was marked with X.
TABLE 7
1)5mm 2 s@40deg.C (day iron chemistry)&Material, and a packing box 201
2)17mm 2 s@40deg.C (day iron chemistry)&Material, and a packing box 401
3)16mm 2 s@40deg.C (flower king, body 162)
4) The Kyoto AD-F is manufactured by Dain chemical industry Co., ltd
TABLE 8
As shown in tables 7 to 8, in test examples C1 to C10 in which greases containing a base oil, a thickener, and an antioxidant in an amount of 0.1 mass% or more and less than 3 mass% relative to the entire base grease and having a mixing consistency of 240 to 300 were used, good results were shown in all the tests.
From the results of the torque fluctuation test, it was found that the viscosity of grease in particular was affected. For example, from test examples C5 to C6 and test example C13, as the consistency becomes smaller, 1000 minutes -1 Torque variation during rotation becomes large. On the other hand, from test examples C1, C4, and C7 and test examples C12 and 14, 50 minutes was elapsed as the consistency increased -1 Torque variation during rotation becomes large. In this way, even when the consistency is in the range of 240 to 300, torque fluctuations can be appropriately suppressed at different rotational speeds under low-speed rotation conditions.
More preferable results are obtained by blending 0.5 mass% or more of an antioxidant with respect to the entire base grease for high temperature resistance. In addition, the low temperature resistance is good as the consistency becomes higher, and the consistency of 260 or higher is more preferable.
In test example C, from the results of tables 7 to 8, a low torque was obtained by combining an appropriate consistency and an appropriate antioxidant, and high torque stability and high temperature resistance and low temperature resistance were obtained. In addition, since a base oil having a low viscosity is used and the consistency is easily brought into an appropriate numerical range, in this test, a predetermined base oil (synthetic hydrocarbon oil alone or a mixed oil of synthetic hydrocarbon oil and ester oil) and a predetermined thickener (aliphatic/alicyclic diurea compound) are combined.
Industrial applicability
The sealed rolling bearing of the present invention can achieve both low torque and high sealing properties, and further can achieve both high water resistance and rust resistance, torque stability, high temperature resistance, and low temperature resistance, and thus can be widely used as a sealed rolling bearing.
Description of the reference numerals
1. Hub bearing (sealed rolling bearing)
2. Outer member
3. Medial member
4. Hub wheel
5. Inner ring
6. Saw tooth part
7. Rolling element
8. Retainer
9. Bearing space
11. Bearing sealing device
12. Core rod
13. Sealing member
14. Sealing ring
15. Flinger ring
16. Bearing sealing device
17. Core rod
18. Sealing member
19. Sliding contact surface
21. Rolling bearing (sealed rolling bearing)
22. Inner ring
23. Outer ring
24. Rolling element
25. Retainer
26. Grease composition
27. Bearing sealing device
28. Core rod
29. Sealing member
G lubricating grease
Claims (13)
1. A seal type rolling bearing comprising a seal member which seals a bearing space, is fixed to a fixed side member, and is in sliding contact with a rotating side member, wherein the seal member has a seal lip which is in sliding contact with the rotating side member, and a grease containing a kinematic viscosity of 6mm at 40 ℃ is coated on at least one of a sliding contact surface of the seal lip and a sliding contact surface of the rotating side member which is in sliding contact with the seal lip 2 /s～45mm 2 The blending consistency of the base oil and the thickener according to JIS K2220 is 220-320.
2. The sealed rolling bearing according to claim 1, wherein the thickener is a urea compound obtained by reacting a polyisocyanate component with at least one monoamine component selected from the group consisting of aliphatic monoamines and alicyclic monoamines, or is a complex lithium soap.
3. The sealed rolling bearing according to claim 1, wherein the base oil is at least one selected from the group consisting of a synthetic hydrocarbon oil, an ester oil and an ether oil.
4. Sealed rolling bearing according to claim 1, characterized in that the base oil comprises only synthetic hydrocarbon oil or is a mixture of the synthetic hydrocarbon oil and an ester oil.
5. Sealed rolling bearing according to claim 1, characterized in that the base oil has a kinematic viscosity at 40 ℃ of 6mm 2 /s～20mm 2 And/s, wherein the mixing consistency is 220-270.
6. The sealed rolling bearing according to claim 1, wherein the grease contains an anti-rust agent, and the mixing consistency is 220 to 280.
7. The sealed rolling bearing according to claim 6, wherein the rust inhibitor is at least one selected from the group consisting of an ester-based rust inhibitor and a sulfonate-based rust inhibitor.
8. The sealed rolling bearing according to claim 6, wherein the grease contains an ester-based rust inhibitor and a sulfonate-based rust inhibitor as the rust inhibitor, and the rust inhibitor is contained in an amount of 0.5 mass% or more and less than 1.5 mass% relative to the total amount of the base oil and the thickener.
9. The sealed rolling bearing according to claim 1, wherein the grease contains an antioxidant, and the antioxidant is contained in an amount of 0.1 mass% or more and less than 3 mass% with respect to the total amount of the base oil and the thickener, and the mixing consistency is 240 to 300.
10. The sealed rolling bearing of claim 9 wherein the antioxidant is an amine-based antioxidant.
11. The sealed rolling bearing according to claim 1, wherein the seal member is formed of nitrile rubber, and has, as the seal lips, a first seal lip, a second seal lip, and a third seal lip in this order from the inner side of the bearing space, and the grease is applied to the sliding contact surfaces of these seal lips.
12. The sealed rolling bearing of claim 1 wherein the sealed rolling bearing is a bearing that rotatably supports an axle.
13. In a sealed rolling bearing comprising a sealing member which seals a bearing space, is fixed to a fixed side member, and is in sliding contact with a rotating side member, the sealed rolling bearing is characterized in that the sealing member has a sealing lip which is in sliding contact with the rotating side member, a grease is coated on at least one of a sliding contact surface of the sealing lip and a sliding contact surface of the rotating side member which is in sliding contact with the sealing lip, the grease contains a base oil, a thickener, and an antioxidant, and the mixing consistency measured in accordance with JIS K2220 is 240 to 300, the mixing consistency being 0.1 mass% or more and less than 3 mass% of the antioxidant relative to the total amount of the base oil and the thickener.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-058900 | 2021-03-30 | ||
| JP2021-058898 | 2021-03-30 | ||
| JP2021058900A JP2022155415A (en) | 2021-03-30 | 2021-03-30 | Sealed rolling bearing |
| JP2021-058899 | 2021-03-30 | ||
| PCT/JP2022/014996 WO2022210531A1 (en) | 2021-03-30 | 2022-03-28 | Sealed rolling bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117043482A true CN117043482A (en) | 2023-11-10 |
Family
ID=83556805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280022492.7A Pending CN117043482A (en) | 2021-03-30 | 2022-03-28 | Sealed rolling bearing |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2022155415A (en) |
| CN (1) | CN117043482A (en) |
-
2021
- 2021-03-30 JP JP2021058900A patent/JP2022155415A/en active Pending
-
2022
- 2022-03-28 CN CN202280022492.7A patent/CN117043482A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022155415A (en) | 2022-10-13 |
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